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Subwavelength porous silica antireflection coating

X. YE1, J. HUANG1, J. C. ZHANG1, X. D. JIANG1,* , W. D. WU1, W. G. ZHENG1

Affiliation

  1. Research Center of Laser Fusion, CAEP, P. O. Box 919-987, MianYang 621900, China

Abstract

A non-close packed polycrystalline colloidal crystal for antireflection (AR) coating was fabricated on transparent substrate by dip coating method. Self assembled polycrystalline colloidal crystals were used as a nanometer scale composite material with controlled thickness and low refractive index. It can turn the max-transmission wavelength from visible light to infrared wave with different withdraw velocities prepared coatings. The novel microstructures have relatively high laser-induced-damage thresholds. A series of films with different structures were fabricated by changing the preparation parameters. The results suggest that the thickness of coatings determines the max-transmission wavelength and the fill factor of nanometer particles exert an influence on the transmission efficiency. The research results indicate that the max-transmission efficiency through the transparent substrate with sub-wavelength porous silica coating is increased to 99.8%. Scanning electron microscope (SEM) was used to characterize the surface morphology of porous silica coatings. And the AR coatings exhibit broadband enhanced transmission. The Nd:YAG laser damage threshold of the as-prepared reflection reducing coatings is about 21.74 J/cm2 at 1064 nm. The environmental durability of subwavelength AR microstructures was investigated with promising initial results reported..

Keywords

Subwavelength, Porous, Antireflective Coatings, Effective Medium Theory, Laser-Induced-Damage Thresholds.

Submitted at: April 5, 2011
Accepted at: May 25, 2011

Citation

X. YE, J. HUANG, J. C. ZHANG, X. D. JIANG, W. D. WU, W. G. ZHENG, Subwavelength porous silica antireflection coating, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 5, pp. 532-536 (2011)